Double Gantzer's Muscles by Four Muscle Bellies and Its Clinical Significance: A Case Report

Abstract

The Gantzer’s muscle (GM) is an additional muscle in the forearm as the accessory head of the flexor pollicis longus (FPL) and accessory head of the flexor digitorum profundus (FDP). We reported a rare case of double GM formed by four muscle bellies. From the dorsal part of flexor digitorum superficialis, small four bellies formed two muscles merging to FDP and FPL, as GMs. These accessory heads of FDP and FPL crossed the ulnar artery and the median nerve, respectively. These additional muscles in the forearm flexor compartment are rare and its clinical and embryological significances should be considered.